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  <title>Replace a function definition with a new implementation</title>
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 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.runkit-function-redefine" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">runkit_function_redefine</h1>
  <p class="verinfo">(PECL runkit &gt;= 0.7.0)</p><p class="refpurpose"><span class="refname">runkit_function_redefine</span> &mdash; <span class="dc-title">
   Replace a function definition with a new implementation
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.runkit-function-redefine-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>runkit_function_redefine</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$funcname</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$arglist</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$code</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$return_by_reference</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$doc_comment</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
  ]] ) : <span class="type">bool</span></div>

  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>runkit_function_redefine</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$funcname</code></span>
   , <span class="methodparam"><span class="type"><a href="class.closure.html" class="type Closure">Closure</a></span> <code class="parameter">$closure</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$doc_comment</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
  ] ) : <span class="type">bool</span></div>


  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">默认情况下，仅在用户空间可删除，重命名，或者修改函数。为了覆盖内部函数，必须启用 <var class="filename">php.ini</var> 中的
<em>runkit.internal_override</em> 设置。</span>
</p></blockquote>

 </div>


 <div class="refsect1 parameters" id="refsect1-function.runkit-function-redefine-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">funcname</code></dt>

     <dd>

      <p class="para">
       Name of function to redefine
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">arglist</code></dt>

     <dd>

      <p class="para">
       New list of arguments to be accepted by function
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">code</code></dt>

     <dd>

      <p class="para">
       New code implementation
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">closure</code></dt>

     <dd>

      <p class="para">
       A <a href="class.closure.html" class="classname">closure</a> that defines the function.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">return_by_reference</code></dt>

     <dd>

      <p class="para">
       Whether the function should return by reference.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">doc_comment</code></dt>

     <dd>

      <p class="para">
       The doc comment of the function.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.runkit-function-redefine-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.runkit-function-redefine-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>runkit 1.0.4</td>
      <td>
       An alternative syntax expecting a <code class="parameter">closure</code> has been added.
      </td>
     </tr>

     <tr>
      <td>runkit 1.0.4</td>
      <td>
       The optional parameters <code class="parameter">return_by_reference</code> and 
       <code class="parameter">doc_comment</code> have been added.
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.runkit-function-redefine-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-551">
    <p><strong>Example #1 A <span class="function"><strong>runkit_function_redefine()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">testme</span><span style="color: #007700">()&nbsp;{<br />&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Original&nbsp;Testme&nbsp;Implementation\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">testme</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">runkit_function_redefine</span><span style="color: #007700">(</span><span style="color: #DD0000">'testme'</span><span style="color: #007700">,</span><span style="color: #DD0000">''</span><span style="color: #007700">,</span><span style="color: #DD0000">'echo&nbsp;"New&nbsp;Testme&nbsp;Implementation\n";'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">testme</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Original Testme Implementation
New Testme Implementation
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.runkit-function-redefine-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="runkit_function_add.html" class="function" rel="rdfs-seeAlso">runkit_function_add()</a> - Add a new function, similar to create_function</span></li>
    <li class="member"><span class="function"><a href="runkit_function_copy.html" class="function" rel="rdfs-seeAlso">runkit_function_copy()</a> - Copy a function to a new function name</span></li>
    <li class="member"><span class="function"><a href="runkit_function_rename.html" class="function" rel="rdfs-seeAlso">runkit_function_rename()</a> - Change a function's name</span></li>
    <li class="member"><span class="function"><a href="runkit_function_remove.html" class="function" rel="rdfs-seeAlso">runkit_function_remove()</a> - Remove a function definition</span></li>
    <li class="member"><span class="function"><a href="runkit_method_redefine.html" class="function" rel="rdfs-seeAlso">runkit_method_redefine()</a> - Dynamically changes the code of the given method</span></li>
   </ul>
  </p>
 </div>


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